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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014ad7ed9df88a9c4638cf46698b5c4a1cc4af83a140cd6a22d447266a685695' 
  AND token = '9mwyk1WC+RuhZ2vvti5hdjQgnbB0kcwm1iv7TgXRhec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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