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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5bdabefe4b123a45ba95f40c7e33359579a5a9cb46536f016d35ffd4c53694' 
  AND token = '0vt7fbZGU46vVg4J7p2hFLKPOLYCAryYiYPVHCqqyQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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