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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8456ee8efb861aa2ae0dad39595883b7633adfc8c8aa26c8a106a20c0be240cb' 
  AND token = 'RJU0LsdSu7vfCM02586SC74LPho8N3Ul1rU3KFgQcU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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