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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35407e6fa315f8c291c4ef0f1d39f0ed7479b9b3b7c036c5686bed9fff1eb84' 
  AND token = 'jzICqrdNtYuuTgzK0M1GGdHWbO5cMXFrytyJYXkNclU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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