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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2b021bdd940e927c53504ac990c81d983fcd0364f4e946fa3ccb1f0b26a512' 
  AND token = 'a7GFzj0uulkF9IEhq8Z9UO7XKi8bvp0fL6tYJJLvdUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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