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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a87839ceb779f7a9112403d7c7f469e0827293224b1d2a741e98a42b65acb6e' 
  AND token = 'alYAHGRhKLm8rv5fEPZJgWekpRWUonNP7j9JYlxG7T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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