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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ede8b392db2fc482ee0c9ff45ef18857cb8e1ecb38326cb57b3016b1599ef3' 
  AND token = '7oR4Qb0E0WQxjG/5lHjDqh8gLZEvreuFgnlEdZm/Tsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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