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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f898882ecfeec6945e041ec7b16e7ab4499a8e21ccd633d377b0e3c3a5406680' 
  AND token = 'SCfnJUfZmRKW4oAbmEmjgnLElN8k7fRFO7/1wFcUAlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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