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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860d1f891e44eed749b21b1d67c4ef324c4278b4e6d16a9055f55c25f7eb3733' 
  AND token = 'KE2kBvh4b3lKvkP4en9Zf037rfvnZPihoy/FdoFXk+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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