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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bdaa4d7a194f3013045323c0e5143e1da6538e13910a13f86ec98d83808ee4' 
  AND token = 'bneGpMp3VkKWAWWvbou0xEgaJkRE001tqIdkYw6Qx98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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