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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37eda112c0366f015f6aa0e74c15ddc64ed94cf10fa2e09b56b6bfaaefd13b07' 
  AND token = '1BCAnqxHxnJBMc/nqTdoFgjCp6BtJM2Oy40KzMHAUtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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