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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b24643f821ee9b9edf4890b708ab1964266aa41b60e7002ee35fc9fc3a925c' 
  AND token = '3tYwILAGZkJavpnk5fi2ZfY31WhHAWutAyZM+SpU7/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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