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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5e60f4c024b9cf4c2ed81c451466add0c96264d5cef4b19d00542fbe15122f' 
  AND token = 'En6VI7Yey6DQ0yWDQsGMINNXjcMDmv4R46xoEsNUWxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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