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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b344ec7ded6cce7045761749cc6f7cebc5804a10318a9a8950d7a71e9d0242' 
  AND token = 'fLKZXgrgF9crc3WSo8gDX2XTRf9EjyDPC9Z0H7SAZVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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