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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4394d352472b18b58914ba8a14dbf3f98584136ac924a637fae6a40758e3830b' 
  AND token = 'rOqfiEkB1ND/VZOXJCu9+1INPqhm8NLr7IEJfP0WVco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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