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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99ee2fe36dcb6881ab534811f5dffefa11d4d38c1c15aef828cb7a2d4dd64e4' 
  AND token = 'SVAdP1ZQAj7rbEoXl+nnAGzAM6rH872uZBeGeMg7i7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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