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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677cf714b7c5507022dc1d57d86a06ff97c3b90c284889ad274a8e4b4beab6ae' 
  AND token = 'p9Pqjb0VhrDAGldD+qeClyeCFWnKWusa2spUzx6BWJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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