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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6529828d881f62673e535416ad9e139c6c8e3fc2fe6e678fda3ae3940eeb28df' 
  AND token = '+V4QpjgvpeLSuFDQlq2do+QLRSKh+3ra1fguRt8mYNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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