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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537f9ff253b4e55a00ece140753a8558ffa710fe9dc4241d36731261e4db6e06' 
  AND token = 'ONyeRUFfcIUW9Lg0YwtdLY7/l7ioSwlLwO6SPzfw+jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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