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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ae7a4ba3cdc4e030f0184da535abd75eefb544c6761c87927a5bd3e9e7b9f5c' 
  AND token = 'ephslzncaYCbgjpUZ3b5kPhWh+4AhXG/aMO7oJhGMpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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