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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ea7ee1ef68fa525cec56e2616390fdbbaa2f1657a8573752cca9e8c86f0139' 
  AND token = 'pmqUjW/3BLQ7fFhDimA6/jMPdGH+Fpzm2cHFdQghYeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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