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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b1328e5600f4d6c776833a781bba1ad2609db54937732a5946780b7d90f9b1' 
  AND token = 'EBPt2CNBomaiiMbbFOd3QQ4Oe01CrkVzu8ssPQxpgow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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