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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794b78bf67d578a9401a63396ffe9dc513c0588ff52c7c4e6aa57d2795c72ccc' 
  AND token = 'bqdXI8RCQl8NbonhFfQt8YCe9M9aLKu66WZbvjxr2+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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