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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c579943bf44c1922f6e34ab6b6159e7e549a74d931148d5c30b2bd97486aa6ea' 
  AND token = 'GJqHzU8qXHF7vlcTVFnRV1sM92XrYYY7lyty4PRac+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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