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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241e902a60e3ebf1253432bffd6ce0acde74354cfef82d147f694d2581bdd692' 
  AND token = 'mvQkHjxXsRohIgyAXvIqb03VIS8RL6XuNTUO6pvjfNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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