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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fcda8315013dbdc48c0cc6719faa03f6bb7d70ab6891fc6e206feac7fd25ee1' 
  AND token = 'gfX5xMye1CU9+3ud7Oxf/nk7OlEF0QaM29zGYZfmiK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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