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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1097e94ae0f71917cba701fbdb18426d103ba77c3013166f5d812a8211b88e0' 
  AND token = 'UEoMiqppntHXt+2QLHAp8XMINdPs5e0cvIwAvIdeqUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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