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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3ab555fafbc3b568cba92811b8e9c4666f86ca2166fc0486a2821387b30f4a' 
  AND token = '99n/QTTpiFI95EfCnN2v8//ZQLQz8GAzcnnIxWur8Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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