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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1604c56393b069a3e4b301f770170762527cc1b09a11e124bf5ff206260532' 
  AND token = 'B+iQ2SuEEf137oYb3zk7QOvqzDawVmWTk9v+h4Gwcx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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