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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c99c95000228cdb14a10f839992eaa0200f4c27065adb4cb3257cdc7842b6c' 
  AND token = '/V9HebCc9T4y2J10JKd0xsbRaM3n+VXJSDohB/APqzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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