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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9c1e444ebf7479e022cc62c67e91dbb48d877e8ecfc713810f6f5760b5f9bc' 
  AND token = '/KqbghdiOdv6mw2jzeeSMlj/HQLh70GxGMMB3akCVD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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