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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1d0ef7a3d1ebeb954e730a98b2d7890e32a42727b37ed80e80b3771d215166' 
  AND token = 'qoo9kDtHMplsPDkYb9d2cm6PM6862xzLRREbvm+O1H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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