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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd413b33b81a77a6223ee4fa2ba562044b3a1a8093be13492fec1075d69d950' 
  AND token = '4nX2YfPNWVDCOTFWaI3vZyUsB7DuLZf5yabu4NNWe44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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