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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830cec7cb58ea9fd365e727235a3cf639e931ec7a79fc6f7ea20b741ce3e4994' 
  AND token = 'ZgH9PfYqxVHSsddqn0Jw7I0dFD59PsLUPOvAqg8XVTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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