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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31256995e1597837f10bd8e70cd0e36d1685d9e990fbcd32829881c60b31bba6' 
  AND token = '24pgt1BQZdgFr2GQA63TE0GkbC2L3GMwqhRw5ZV5Zko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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