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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3dd25783196d22efb928443da92e23c186bc95c5b38319ba4e7707ecca6eae' 
  AND token = 'QbYiTTVH4stA2M/mzKq5keqDyLc6vHgjVUaFuZrucsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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