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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb20769295aedf2931aa3c421e684e8e140c426e44572788d8f05f49a61619f' 
  AND token = 'MC7JLVLmFazbY/Igzuck13KnSVNzD0nJon/7t0c2jK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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