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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62382f7a75a33c2eb3fcbcf796a8bd7623a8a2731b8d67f81bffa693ef31fcf' 
  AND token = '5YnWUMyA22zKQufoeSPWfWG2GV1YhdDbOU3GgS1NmGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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