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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f734277b8dd0cb82e938b11775093d44d36c298b52a8b06ebc099c75ae67fa66' 
  AND token = 'h/2+xXwJLWyMdv/JDutEFfexMr4CI72MOelMmVot3Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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