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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e667f2c187b0014629232d2f8e7975526fa87e9ea9137439e831e4b0662a16e' 
  AND token = 'kFPecAiIhwByBipT6aPwgC/VkWyZwJhX1Mk37gfR9aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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