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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3c2215cc86568b033022293e62af562bb3cd75192c5681bb7ec9a65cf37a37' 
  AND token = '+cvZEvojsRKGxS1nmcvOJ4J2bvgBhEvLqK48T8ECurA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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