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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6852d16c2f9471c75e8b8307ad270bf1f5954089e1e95547dabea1196829e4ea' 
  AND token = 'BNDPVrT18GQmBEoBWO/7dMti7CuK0orM0hvKhs0P3Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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