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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e5d66195babb2cb92d3c332600b4864f9421faaf3b5a8cfdd13124e43dbcdb' 
  AND token = '5dGgpVKwGC6Jrbg183HO92rLpCg4nui31iOFxgLqL1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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