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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6299b75f851acadead95d0c58c88b353bd7374cd4c5a36475b4d2baa12def6' 
  AND token = '8TPaOEWl34G7JRjGT+ZnaVCF5ajZREPR2lADcd7eJX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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