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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a53c97ee7a9a97861c5a7f4caa3450ea579b22b5402774d26604a090e530ff' 
  AND token = '7PllKwLSHMMZ6IGa7MRvla+tTKpdKdunczBjm/iBz9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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