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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce1dc544ad86c8be5680ac2aedcfe465a4cfbc83b5b5419555f36a745dcf7bb' 
  AND token = '2K4YqaBk3xNy6yb4rTYaUGnezy9/evnZDYSvxsvd6JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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