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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383d7d72d47a634c2ea1394927101a3963b0b9f8352a3c28e7189c42bd1c76b5' 
  AND token = '3uyAIDesA15cNaWe/MMabDpAEnNkpwsGbtRE7S4Nybo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}