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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6565f8c842871a6e00edf8a24a6e52100188b92131c4778b0e18b55d8f5bc3d' 
  AND token = 'eiAUHlHhbvOgkyLKo61dSWpYIFHd91woxJ0jkSMGQLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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