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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20634323829de91d2ec005ed16741a66dc7dad6f0aaf1f1537d5a80de99b625d' 
  AND token = '4L5ojB68foljVAeSdTKDVuqCbECnmq2s4PBXAxn4R3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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