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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c82b0a3f823f5e4f20e1f94c3dff1a7d5ae0d6aaaeac9aa23652149eda027d7' 
  AND token = 'D2tD1DJ8S9sRaDztSbfQh8pIgvvy2npwhSUHgO2rMOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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