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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d65cbca6e62bd1d03ac33ba2c2f38260f2243f581c5c19ace3dcfe696cf884' 
  AND token = 'jXtafxO243dxtgjV0V6DU2uoTAsBc9iZ56eZe1hPUHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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