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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5c70b1dab05bdad97dd3e57958f08884a5d84664bc2f18611b39f9b73280e5' 
  AND token = 'dYSa76DmMdiZknmWeJ+1yA+iGzrp7QDqx2ipXF3Xqno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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