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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2763bb4037dc627d7b7cbb8c531ca0bcf498f936c743376d95d46ea51e8a57dd' 
  AND token = '+osIKL4x6PBAR0yWF2odLYBunxXqkq37LoVfn4QZv5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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