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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677ec7f93d37671c434d1c756b8f9da7fca55c6036cfe60def6801a1d6b8987c' 
  AND token = '6pPqHQehHLbGWRqvbLlbtbEz2DFO5Jj39pRGCyN6+tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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