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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c401e76f57510bd0fa3ce87702a51fd8a9fc2069394b7333b842a4bd1ed7acd' 
  AND token = 'iC3weW6M4hb8PuU7helV6Orkpwnrvcvfri+otriXmvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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