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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cfd013a50819638732cdca8ee8009f490d27c1f1ba5c76669c48066dd1d61a' 
  AND token = '1jitcKQldOMFYzO2VIZPh6lhvncn+Y25UUM7YgyQs8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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