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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa06e2be40bebd655cff5e59e548d2135bd3b8033531679d6bb8344ed74efbf7' 
  AND token = '2rP5AeWfoCY0S5YdM8hnlcjlQuVWuQYRoc7ot4eDvEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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