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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0200e4e7c0f37d9bb20c0e522788c787f56d225d918a39d0ca92722a590702e' 
  AND token = 'o+JtiszB7hDi64IU1DiuatCekvvr7NmcdB5za4T7OzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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