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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe3424b1cc2e095bfdb318a24288af7071003ea0af26983a46f60335b46f828' 
  AND token = 'J59cIKH/Y426mg4BEyirAlr2LoyLA8mZZ/mapnDEULM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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