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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574f34a29577ef198da847eb9c379487af4087818b9d39b0023fa2fffd972e23' 
  AND token = 'HniVUCzXUtpU/D8kh4Ss5PXt+jNLg0sG1SMKkeNkzbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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